My friend's uncle was really lucky but not every one will be blessed like that. That is why everyone especially those at high risk of heart conditions should know more about how their heart works, how different heart complications will affect the heart's and the circulatory system's functions, and most important of all, how one can prevent acquiring these problems.
I believe that knowledge could save you and that's why I really recommend that everyone checks out heartlibrary.com because it is the website that has videos and contents about the anatomy of the heart and common heart problems. Real doctors who specializes in hearts and the circulation system informs you about the said topic with an easy to understand language. The website is also a great source for finding a doctor near you and other important tidbits of information.
So as the saying goes, Knowledge is Power!